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Linux - Networking This forum is for any issue related to networks or networking.
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Old 07-08-2004, 02:12 PM   #1
Registered: May 2003
Location: Vancouver
Distribution: RH9
Posts: 100

Rep: Reputation: 15
Universal default gateway address resolution

Thats what I need! A universal default gateway address resolution.

Here's the scenario:

I'm building an embedded linux router off of an SBC, and I need a way of finding the gateway IP address of the internet connection. AKA the "default" gateway address. This is gotten easily by issuing the command "%route | grep default". At home mine comes up as "d-154-251-x-x" The numbers in between the dashes is the IP address of the gateway. At my fathers the command results in "24.82.x.x". It gives an actual IP!

Since different ISP's issue the gateway address via dhcp in different formats, as indicated above, I need to find a way of finding the IP address of the gateway. This has to be universal because I have a perl cgi script that displays the IP connection settings of my router on a web page.

How do I find the gateway IP address?

Oh, BTW: i tried to use traceroute, and it worked great, the problem is the firewall is very secure and when it's on it blocks traceroute from doing its job.
Old 07-08-2004, 02:48 PM   #2
Registered: Mar 2003
Location: Scotland
Distribution: Slackware, RedHat, Debian
Posts: 12,047

Rep: Reputation: 67
Try using "route -n" this will use ips and not hostnames.
Old 07-09-2004, 02:28 AM   #3
Registered: May 2003
Location: Vancouver
Distribution: RH9
Posts: 100

Original Poster
Rep: Reputation: 15

I promise to read the --help before I post from now on! :P


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